CVE-2026-33636

HIGHNVD 7.67.6—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.6 under NVD CVSS v3. EPSS exploit probability: 0.1%, top 84% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
7.6
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 7.6Exploit: NoneExposed: 0

A fix is available — apply it.

LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable Network Graphics) raster image files. In versions 1.6.36 through 1.6.55, an out-of-bounds read and write exists in libpng's ARM/AArch64 Neon-optimized palette expansion path. When expanding 8-bit paletted rows to RGB or RGBA, the Neon loop processes a final partial chunk without verifying that enough input pixels remain. Because the implementation works backward from the end of the row, the final iteration dereferences pointers before the start of the row buffer (OOB read) and writes expanded pixel data to the same underflowed positions (OOB write). This is reachable via normal decoding of attacker-controlled PNG input if Neon is enabled. Version 1.6.56 fixes the issue.

CVSS v3
7.6
EG Score
7.6(medium)
EPSS
44.0%
KEV
Not listed

Published

March 26, 2026

Last Modified

April 2, 2026

Advisory Details (3)

Auto-updated Jun 12, 2026
Patch available. Sources: github_commit, github.
github Patch Available

Out-of-bounds read/write in the palette expansion on ARM Neon · Advisory · pnggroup/libpng · GitHub

https://github.com/pnggroup/libpng/security/advisories/GHSA-wjr5-c57x-95m2
github_commit

commit aba9f18eba87 (pnggroup/libpng)

Fix landed in pnggroup/libpng commit aba9f18eba87 — awaiting tagged release

https://github.com/pnggroup/libpng/commit/aba9f18eba870d14fb52c5ba5d73451349e339c3
github_commit

commit 7734cda20cf1 (pnggroup/libpng)

Fix landed in pnggroup/libpng commit 7734cda20cf1 — awaiting tagged release

https://github.com/pnggroup/libpng/commit/7734cda20cf1236aef60f3bbd2267c97bbb40869

Vendor Advisories for CVE-2026-33636(20)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(30)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatrhaiis/model-opt-cuda-rhel9:17806819842026-06-10redhat
redhatlibpng-2:1.6.37-12.el9_2.32026-05-14redhat
redhatlibpng-2:1.6.37-12.el9_4.32026-05-14redhat
redhatlibpng-2:1.6.37-12.el9_0.32026-05-14redhat
redhatlibpng-2:1.6.37-12.el9_6.32026-05-14redhat
redhatlibpng-2:1.6.40-8.el10_0.32026-05-14redhat
redhatthunderbird-0:140.9.1-1.el8_62026-05-11redhat
redhatlibpng-2:1.6.37-12.el9_7.32026-05-07redhat
redhatlibpng-2:1.6.40-8.el10_1.32026-05-07redhat
redhatthunderbird-0:140.9.1-1.el8_82026-05-06redhat
redhatfirefox-0:140.9.1-2.el7_92026-05-06redhat
redhatthunderbird-0:140.9.1-1.el8_42026-05-06redhat
redhatfirefox-0:140.9.1-1.el9_22026-05-06redhat
redhatfirefox-0:140.9.1-1.el8_42026-05-05redhat
redhatfirefox-0:140.9.1-1.el8_82026-05-05redhat
redhatfirefox-0:140.9.1-1.el9_42026-05-05redhat
redhatfirefox-0:140.9.1-1.el8_62026-05-05redhat
redhatfirefox-0:140.9.1-1.el9_62026-05-05redhat
redhatfirefox-0:140.9.1-1.el10_02026-05-05redhat
redhatfirefox-0:140.9.1-1.el9_02026-05-05redhat
redhatthunderbird-0:140.9.1-1.el9_62026-05-04redhat
redhatthunderbird-0:140.9.1-1.el9_22026-05-04redhat
redhatthunderbird-0:140.9.1-1.el9_42026-05-04redhat
redhatthunderbird-0:140.9.1-1.el9_02026-04-30redhat
redhatfirefox-0:140.9.1-1.el8_22026-04-29redhat
redhatthunderbird-0:140.9.1-1.el10_02026-04-29redhat
redhatjava-25-openjdk-1:25.0.3.0.9-1.el92026-04-22redhat
redhatjava-11-openjdk-portable2026-04-22redhat
redhatthunderbird-0:140.9.1-1.el10_12026-04-22redhat
redhatjava-11-openjdk-1:11.0.31.0.11-1.el92026-04-22redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Additional Vendor Advisories

(10)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 9× in last 7d / 43× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 106 total refreshes for this CVE.

  1. 2026-07-15 16:57 UTCEPSS rescore
  2. 2026-07-15 16:57 UTCEPSS rescore
  3. 2026-07-15 02:00 UTCEPSS rescore
  4. 2026-07-13 22:30 UTCEPSS rescore
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  20. 2026-06-29 14:06 UTCEPSS rescore
  21. 2026-06-29 14:06 UTCEPSS rescore
  22. 2026-06-29 03:32 UTCOSV refresh
  23. 2026-06-28 14:07 UTCEPSS rescore
  24. 2026-06-28 14:07 UTCEPSS rescore
  25. 2026-06-28 04:56 UTCEPSS rescore
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  1. 2026-06-28 04:56 UTCEPSS rescore
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  3. 2026-06-25 13:49 UTCEPSS rescore
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  5. 2026-06-24 14:05 UTCEPSS rescore
  6. 2026-06-23 21:33 UTCEPSS rescore
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  8. 2026-06-22 14:25 UTCEPSS rescore
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  10. 2026-06-21 14:56 UTCEPSS rescore
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  20. 2026-06-14 23:18 UTCEPSS rescore
  21. 2026-06-13 23:00 UTCEPSS rescore
  22. 2026-06-12 23:12 UTCEPSS rescore
  23. 2026-06-12 23:12 UTCEPSS rescore
  24. 2026-06-11 23:20 UTCEG score recompute
  25. 2026-06-11 23:20 UTCVendor advisory
  26. 2026-06-11 14:00 UTCEPSS rescore
  27. 2026-06-10 22:18 UTCEPSS rescore
  28. 2026-06-10 14:47 UTCEG score recompute
  29. 2026-06-10 14:47 UTCVendor advisory
  30. 2026-06-10 13:22 UTCEPSS rescore
  31. 2026-06-10 02:59 UTCEG score recompute
  32. 2026-06-10 02:59 UTCVendor advisory
  33. 2026-06-09 15:31 UTCEG score recompute
  34. 2026-06-09 15:31 UTCVendor advisory
  35. 2026-06-08 14:17 UTCEPSS rescore
  36. 2026-06-08 14:17 UTCEPSS rescore
  37. 2026-06-08 13:22 UTCEG score recompute
  38. 2026-06-08 13:22 UTCVendor advisory
  39. 2026-06-07 23:27 UTCEG score recompute
  40. 2026-06-07 23:27 UTCVendor advisory
  41. 2026-06-07 15:25 UTCEPSS rescore
  42. 2026-06-07 15:25 UTCEPSS rescore
  43. 2026-06-07 15:25 UTCEPSS rescore
  44. 2026-06-07 12:03 UTCEG score recompute
  45. 2026-06-07 12:03 UTCVendor advisory
  46. 2026-06-06 13:47 UTCEPSS rescore
  47. 2026-06-06 13:47 UTCEPSS rescore
  48. 2026-06-05 22:47 UTCEPSS rescore
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  58. 2026-06-01 06:13 UTCOSV refresh
  59. 2026-05-31 22:30 UTCEPSS rescore
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  74. 2026-05-26 07:18 UTCEPSS rescore
  75. 2026-05-23 00:09 UTCEG score recompute

Frequently asked(5)

What is CVE-2026-33636?
CVE-2026-33636 is a high vulnerability published on March 26, 2026. LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable Network Graphics) raster image files. In versions 1.6.36 through 1.6.55, an out-of-bounds read and write exists in libpng's ARM/AArch64 Neon-optimized palette expansion path. When expanding 8-bit…
When was CVE-2026-33636 disclosed?
CVE-2026-33636 was first published in the National Vulnerability Database on March 26, 2026, with the most recent update on April 2, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-33636 actively exploited?
CVE-2026-33636 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 44.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-33636?
CVE-2026-33636 has a CVSS v3 base score of 7.6 (NVD).
How do I remediate CVE-2026-33636?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-33636, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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